国产无溶剂有机硅浸渍漆TJ1173与进口漆的性能比较

介绍了国产TJ1173无溶剂有机硅浸渍漆的各项性能,并从结构和性能上与国外瓦克公司的H62C无溶剂有机硅浸渍漆进行了比较。结果表明:TJ1173漆和H62C漆的组成基本一致,比较综合性能,国产无溶剂有机硅浸渍漆TJ1173达到了瓦克公司H62C漆的同等水平。     

无溶剂环氧重防腐涂料的制备及性能测试

制备了一种无溶剂环氧重防腐涂料并进行了性能检测,分别讨论了环氧树脂、稀释剂、助剂、填料和固化剂对漆膜性能的影响。试验表明,添加环氧树脂量的20%的稀释剂2020对漆膜的防腐性能无不良影响,加入5%的湿法绢云母粉可以显著提高漆膜的抗介质渗透能力。     

水基性透明液体剂型的加工、性能和差异(Ⅱ)

4 微乳剂早在20世纪40年代,Hoar和Schulman等人发现油-水混合物借助表面活性剂可以自发地形成透明的分散体系,由于所形成的液滴粒径非常小,后来将这种体系命名为微乳液.此后证明,它是一个热力学上稳定的、均相的水包油型乳液可溶体系,加工的微乳液剂型即为微乳剂.微乳液存在3种结构类型,即O/W型、W/O型和双连续相结构(也称为中间相微乳型).这3种类型可以在一定条件下互相转变[10].农药上的微乳剂大都为以水为连续相的O/W型乳液.     

双组分喷涂型无溶剂超厚膜环氧重防腐涂料的研制

选用高环氧值、低黏度改性环氧树脂作为基料树脂,按一定比例复配曼尼斯碱和腰果酚酚醛胺为固化剂,搭配自制触变性浆体、多活性端基低黏度聚合物活性稀释剂、缓蚀型颜填料及助剂,制备了一种双组分喷涂型无溶剂超厚膜环氧重防腐涂料,并对涂料性能影响因素进行了分析,对涂层性能进行了测试,结果显示该涂料机械性能和防腐性能优异。     

功能化Bronsted-Lewis酸性离子液体催化合成1-氨基烷基-2-萘酚

本文合成了Bronsted-Lewis酸性咪唑离子液体[CH2COOHmim]FeCl3Br,并研究了该离子液体作为催化剂,将2-萘酚、芳香醛、酰胺三组分在无溶剂条件下于100 ℃合成一系列的1-氨基烷基-2-萘酚。产物用IR、1HNMR、13CNMR对其结构进行确认。实验结果表明该方法环境友好,操作简单,产率较高,催化剂离子液体可多次循环使用。     

苯甲醛缩氨基硫脲类化合物的无溶剂合成

以液体苯甲醛和N4-苯基氨基硫脲为原料,浓盐酸作催化剂,室温条件下,在无溶剂条件下合成了4个苯甲醛缩氨基硫脲类化合物。产品经元素分析、红外光谱与核磁共振氢谱表征,确定为目标化合物。结果表明,无溶剂条件下的反应在2 h内产率达到90%,是合成该类化合物高产、低耗、绿色、环保的好方法。     

A simple green synthesis of (Z)-5-arylmethylene-4- thioxothiazolidines and thiopyrano[2,3-d]thiazolidine-2-thiones in PEG-400 under catalyst-free conditions

An improved Knoevenagel condensation of various aromatic aldehydes with thiazolidine-2,4-dithione and with 4-thioxothiazolidin-4-one can be achieved at room temperature in polyethylene glycol-400 without catalyst to afford (Z)-5-arylmethylene-4-thioxothiazolidine derivatives 3a–3o. Also, the [4+2] cyloaddition reaction of 3a–3g with N-phenylmaleimide 4 gave the cycloadducts 5a–5g under the same reactions conditions. The structure of all the newly synthesized compounds was established on the basis of the elemental analysis and spectral data. This process is a simple, efficient, economical, and environmentally benign compared to classical reactions.     

新型耐高温无溶剂环氧胶粘剂的研制

采用DTGM53、DDRS3521这2种多官能环氧树脂,以低黏度的甲基四氢苯酐为固化剂,在促进剂E-24作用下,制备了综合性能优异的新型耐高温无溶剂环氧胶粘剂。同时,对该环氧胶粘剂的黏度、凝胶化时间、粘接性能、活化能等作了系统的研究。结果表明,该胶粘剂具有优异的高温拉伸剪切强度,200℃时高达16.1 MPa。     

Expression and characterization of a CALB-type lipase from Sporisorium reilianum SRZ2 and its potential in short-chain flavor ester synthesis

A lipase from Sporisorium reilianum SRZ2 (SRL) with 73% amino acid sequence identity to Candida antarctica lipase B (CALB) was cloned and overexpressed in Pichia pastoris. The recombinant SRL showed a preference for short-chain p-nitrophenyl esters. It achieved maximum activity at pH 8.0 and 65°C for p-nitrophenyl hexanoate (C6) with K_m and k_cat/K_m values of 0.14 mmol∙L⁻¹ and 1712 min⁻¹∙mmol∙L₋₁ at 30°C, respectively. SRL displayed excellent thermostability and pH stability, retaining more than 79% of its initial activity after incubation at 60°C for 72 h and 75% at pH 3 to 11 for 72 h. It also maintained most of its activity in the presence of inhibitors and detergents except sodium dodecyl sulfate, and it tolerated organic solvents. SRL was covalently immobilized and successfully used for ethyl hexanoate synthesis in cyclohexane or in a solvent-free system with a high conversion yield (>95%). Furthermore, high conversion yield was also achieved for the synthesis of various short-chain flavor esters when high substrate concentrations of 2 mol∙L⁻¹ were applied. This study indicated that a CALB-type lipase from S. reilianum SRZ2 showed great potential in organic ester synthesis.     

Solvent-free enzymatic synthesis of structured lipids containing CLA from coconut oil and tricaprylin

Lipase-catalyzed acidolysis of different TAG with CLA was performed to produce structured lipids (SL) containing CLA. An immobilized lipase from Mucor miehei (Lipozyme IM, Novo Nordisk Inc., Franklinton, NC) was used as the biocatalyst in a solvent-free system. Conconut oil and tricaprylin, which are sources of medium-chain FA, were the starting substrates, and a mixture of FFA (MFFA) containing 73% CLA was the donor of the acyl groups. For each TAG, four different ratios of TAG/MFFA were blended to prepare about 500 g of mixture containing 10, 20, 30, and 40% CLA (w/w). Each blend was reacted with 5% lipase at 65°C for 48 h under nitrogen. Over the range of TAG/MFFA ratios examined, CLA was incorporated effectively by the enzyme. Lipozyme IM exhibited no special preference for any particular FA, since the incorporation of FA was proportional to their concentration in the system. FFA, PV, p-anisidine value (p-AV), iodine value (IV), and saponification number (SN) were evaluated for all the SL. FFA, PV, and p-AV depended on the purification process and showed no significant deterioration of SL with respect to the original TAG, whereas IV and SN depended on the composition of the SL, mainly the CLA content.